Off-grid hybrid electrolytic hydrogen production system

Abstract

An off-grid hybrid electrolytic hydrogen production system provided in the present application comprises a new energy power generation unit and an energy storage unit. A power conversion unit converts electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production. An electrolysis unit comprises a proton exchange membrane hydrogen production module and a solid oxide electrolysis module, used to produce hydrogen after the introduction of electric energy. A controller uses control of charge and discharge of the energy storage unit to track an electric energy fluctuation value output by the new energy power generation unit, so that a value of total electric energy power fluctuation output by the new energy power generation unit and the energy storage unit is within a set range. The described solution provided by the present application can improve the hydrogen production efficiency of the entire hydrogen production system, and ensure that the hydrogen production system can achieve off-grid operation. Moreover, the present application eliminates the influence of power generation fluctuation of a new energy power generation unit on a hydrogen production result, by means of causing the total power fluctuation output by the new energy power generation unit and the energy storage unit to be within a set range.

Description

An off-grid hybrid electrolysis hydrogen production system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 28, 2023, with application number 202311273562.9 and invention name “A hybrid off-grid electrolysis hydrogen production system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of hydrogen preparation, and in particular to an off-grid hybrid electrolysis hydrogen production system. Background Art

[0003] Hydrogen has the characteristics of being green, low-carbon and having high energy density, so hydrogen energy has become a widely used energy source. As the demand for hydrogen energy gradually increases, research on hydrogen preparation in the existing technology is becoming more and more extensive. The hydrogen production system currently used usually includes an electrolysis unit, which can be a proton exchange membrane electrolysis module and an alkaline water electrolysis module. Electric energy is introduced through the power grid, and the power supply of the proton exchange membrane electrolysis module and the alkaline water electrolysis module is controlled to achieve electrolytic hydrogen production. During the power-on process, the power grid will be used more frequently. However, the energy source of the power supply from the power grid includes energy provided by fossil fuels, which will cause certain pollution, and the proton exchange membrane electrolysis and alkaline water electrolysis methods used in the existing technology still have room for improvement in the efficiency of hydrogen production.

[0004] Summary of the Invention

[0005] The technical problem to be solved by this application is that the existing hydrogen production schemes have certain pollution and low hydrogen production efficiency. To this end, this application proposes an off-grid hybrid electrolysis hydrogen production system.

[0006] In response to the above technical problems, the technical solution of the present application provides an off-grid hybrid electrolysis hydrogen production system, comprising:

[0007] A new energy power generation unit, comprising at least one power generation module driven by new energy;

[0008] Energy storage unit, used to store or release electrical energy;

[0009] a power conversion unit, the input end of which is connected to the new energy power generation unit and the energy storage unit, and is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production;

[0010] an electrolysis unit, comprising a proton exchange membrane hydrogen production module and a solid oxide electrolysis module; the input end of the electrolysis unit is connected to the output end of the power conversion unit, and the electrolysis unit generates hydrogen after receiving electrical energy;

[0011] A controller is connected to the new energy power generation unit, the energy storage unit, and the power conversion unit; the controller allocates the electric energy required by the energy storage unit and the hybrid electrolysis hydrogen production system according to the output electric energy value of the new energy power generation unit. The energy storage unit is used to provide a reference voltage and frequency to the hybrid electrolysis hydrogen production system, and to shift the fluctuation of the new energy power generation unit so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range.

[0012] In the off-grid hybrid electrolysis hydrogen production system described in some schemes, the solid oxide electrolysis module is equipped with a reducing gas inlet; the proton exchange membrane hydrogen production module is equipped with a hydrogen outlet; the hydrogen outlet is sealed and connected to the reducing gas inlet, and the hydrogen produced by the proton exchange membrane hydrogen production module is partially transported to the solid oxide electrolysis module.

[0013] In some embodiments of the off-grid hybrid electrolysis hydrogen production system, the electrolysis unit further comprises:

[0014] An alkaline hydrogen production module, wherein the input end of the alkaline hydrogen production module is connected to the output end of the power conversion unit.

[0015] In the off-grid hybrid electrolysis hydrogen production system described in some schemes, the alkaline hydrogen production module is equipped with a gas-liquid separator, the proton exchange membrane hydrogen production module is equipped with an oxygen outlet, and the oxygen outlet of the proton exchange membrane hydrogen production module is connected to the gas-liquid separator.

[0016] In some schemes of the off-grid hybrid electrolysis hydrogen production system, part of the cold air output by the gas-liquid separator is output to the cooling gas input port of the power conversion unit to cool the power conversion unit.

[0017] The off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0018] A heat exchange unit including a thermal coupling connection module;

[0019] The thermal coupling connection module has energy interaction with the proton exchange membrane hydrogen production module, the solid oxide electrolysis module and the alkaline hydrogen production module;

[0020] The thermal coupling connection module includes a heat storage module, and the heat storage module includes one or more of a sensible heat storage submodule, a latent heat storage submodule and a thermochemical heat storage submodule;

[0021] The heat storage module is used to convert and store excess electrical energy into thermal energy when the electrical energy provided by the power conversion unit is greater than the electrical energy required for hydrogen production; and to release thermal energy to the proton exchange membrane hydrogen production module and / or the solid oxide electrolysis module and / or the alkaline hydrogen production module when the new energy power generation unit stops providing electrical energy.

[0022] The off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0023] A heat exchange network module is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module and the refrigeration submodule of the alkaline hydrogen production module;

[0024] The heat exchange network module is connected to the power conversion unit, and the heat exchange network module is used to cool the power conversion unit.

[0025] The off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0026] Water source, used to provide pure water for hydrogen production;

[0027] A pipeline, a portion of which is arranged outside the power conversion unit, has an input end connected to the water source, and an output end connected to the water inlet end of the electrolysis unit.

[0028] The off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0029] an alkaline solution tank, used to provide alkaline solution to the alkaline hydrogen production module;

[0030] A portion of the alkali solution delivery pipe is arranged outside the power conversion unit, an input end of the pipe is connected to the alkali solution tank, and an output end of the pipe is connected to an alkali solution inlet for providing alkali solution to the alkaline hydrogen production module.

[0031] In some embodiments of the off-grid hybrid electrolysis hydrogen production system, the new energy power generation unit includes a wind power generation module and a photovoltaic power generation module;

[0032] The controller tracks the output electric energy value of the new energy power generation unit to obtain an electric energy prediction value, and adjusts the required electric energy of the hybrid electrolysis hydrogen production system and the energy storage unit according to the electric energy prediction value; if the electric energy prediction value of the new energy power generation unit exceeds the actual output value, the energy storage unit is controlled to store the excess electric energy; if the electric energy prediction value is lower than the actual output value, the energy storage unit is controlled to output electric energy to supplement the electric energy difference required by the hybrid electrolysis hydrogen production system.

[0033] The technical solution of this application has the following technical effects compared with the existing technology:

[0034] The off-grid hybrid electrolysis hydrogen production system provided by the present application includes a new energy power generation unit and an energy storage unit. The power conversion unit is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production. The electrolysis unit includes a proton exchange membrane hydrogen production module and a solid oxide electrolysis module, which is used to produce hydrogen after the introduction of electric energy. The controller tracks the output electric energy value of the new energy power generation unit in real time according to the charging and discharging of the energy storage unit, so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range. In the above-mentioned solution provided by the present application, the electrolysis unit includes a solid oxide electrolysis module, which has a higher hydrogen production efficiency, thereby improving the hydrogen production efficiency of the entire hydrogen production system. In addition, the solution of the present application utilizes a power supply method that cooperates with the new energy power generation unit and the energy storage unit to ensure that the hydrogen production system can achieve off-grid operation. Moreover, the solution controls the energy storage unit through the controller, which can eliminate the random fluctuations of the new energy power generation unit, maintain the voltage and frequency required by the hybrid electrolysis hydrogen production system, and eliminate the influence of the power generation fluctuations of the new energy power generation unit on the hydrogen production effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, which will help to understand the objects and advantages of the present application.

[0036] FIG1 is a schematic structural diagram of an off-grid hybrid electrolysis hydrogen production system according to an embodiment of the present application;

[0037] FIG2 is a schematic diagram of a structure in which hydrogen output from a proton exchange membrane hydrogen production module is used as a reducing gas for a solid oxide electrolysis module according to an embodiment of the present application;

[0038] FIG3 is a schematic structural diagram of an off-grid hybrid electrolysis hydrogen production system according to another embodiment of the present application;

[0039] FIG4 is a schematic diagram of a structure in which oxygen output from a proton exchange membrane hydrogen production module and an alkaline hydrogen production module is used to cool a power conversion unit according to one embodiment of the present application;

[0040] FIG5 is a schematic diagram of an arrangement of thermal coupling connection modules according to an embodiment of the present application;

[0041] FIG6 is a schematic diagram of the arrangement of a heat exchange unit according to an embodiment of the present application;

[0042] FIG7 is a schematic diagram of a structure for cooling a power conversion unit with pure water for hydrogen production according to an embodiment of the present application;

[0043] FIG8 is a schematic structural diagram of cooling a power conversion unit with an alkaline solution for hydrogen production according to one embodiment of the present application;

[0044] FIG9 is a schematic structural diagram of a new energy power generation unit according to an embodiment of the present application. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0046] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0049] An off-grid hybrid electrolysis hydrogen production system according to one embodiment of the present application, as shown in FIG1 , includes:

[0050] The new energy power generation unit 10 includes at least one power generation module driven by new energy.

[0051] The energy storage unit 20 is used to store or release electrical energy.

[0052] The power conversion unit 30 has an input connected to the new energy generation unit 10 and the energy storage unit 20 and is configured to convert the electrical energy output by the new energy generation unit 10 and the energy storage unit 20 into electrical energy suitable for hydrogen production. The power conversion unit 30 may include at least one interface for connecting to the new energy generation unit 10 and the energy storage unit 20.

[0053] The electrolysis unit 40 comprises a proton exchange membrane hydrogen production module 401 and a solid oxide electrolysis module 402. The input of the electrolysis unit 40 is connected to the output of the power conversion unit 30. Upon receiving electrical energy, the electrolysis unit 40 generates hydrogen. The proton exchange membrane hydrogen production module 401 accounts for more than 20% of the capacity of the electrolysis unit 40. The power conversion unit 30 includes a voltage conversion circuit and electrical interfaces that match the different hydrogen production modules in the electrolysis unit 40. These interfaces are adaptively selected based on the efficiency, operating range, and dynamic response characteristics of each hydrogen production module.

[0054] The controller 100 is connected to the new energy generation unit 10, the energy storage unit 20, and the power conversion unit 30. Based on the output power of the new energy generation unit 10, the controller 100 allocates the power required by the energy storage unit 20 and the power conversion unit 30 of the hybrid electrolysis hydrogen production system. The energy storage unit 20 is used to provide a reference voltage and frequency to the power conversion unit 30 of the hybrid electrolysis hydrogen production system, thereby translating fluctuations in the output power of the new energy generation unit 10. The controller 100 and energy storage unit 20 can be provided independently or integrated into the power conversion unit 30 or the electrolysis unit 40.

[0055] The off-grid hybrid electrolysis hydrogen production system in the above embodiment includes a new energy power generation unit 10 and an energy storage unit 20. The power conversion unit 30 is used to convert the electric energy output by the new energy power generation unit 10 and the energy storage unit 20 into electric energy suitable for hydrogen production. The electrolysis unit 40 includes a proton exchange membrane hydrogen production module 401 and a solid oxide electrolysis module 402, which are used to produce hydrogen after the introduction of electric energy. The controller 100 tracks the output electric energy of the new energy power generation unit 10 according to the charge and discharge control of the energy storage unit 20, so that the total electric energy fluctuation value output by the new energy power generation unit 10 and the energy storage unit 20 is within a set range. In the above scheme, the electrolysis unit 40 includes a solid oxide electrolysis module 402, which has a higher hydrogen production efficiency, thereby improving the hydrogen production efficiency of the entire hydrogen production system. In addition, the power supply method that cooperates with the new energy power generation unit 10 and the energy storage unit 20 can ensure that the hydrogen production system can achieve off-grid operation. Moreover, by controlling the energy storage unit 20 through the controller 100, random fluctuations in power generation of the new energy power generation unit 10 can be eliminated, the voltage and frequency required by the hybrid electrolysis hydrogen production system can be maintained, the total power fluctuations output by the new energy power generation unit 10 and the energy storage unit 20 are kept within a set range, the influence of the power generation fluctuations of the new energy power generation unit 10 on the hydrogen production effect is eliminated, and the tracking accuracy of the power output of the new energy power generation unit 10 meets the requirements.

[0056] In some embodiments, the off-grid hybrid electrolysis hydrogen production system is shown in FIG2 , wherein the solid oxide electrolysis module 402 is equipped with a reducing gas inlet; the proton exchange membrane hydrogen production module 401 is equipped with a hydrogen outlet; the hydrogen outlet is sealedly connected to the reducing gas inlet, and the hydrogen produced by the proton exchange membrane hydrogen production module 401 is partially transported to the solid oxide electrolysis module 402. In this embodiment, the solid oxide electrolysis module 402 has a long startup and shutdown time, and its operating pressure is much lower than that of the proton exchange membrane hydrogen production module 401. It operates at 750-800°C under normal operating conditions. During the non-steady-state transition period such as startup and shutdown, the anode requires a reducing gas to prevent material oxidation. To this end, this embodiment introduces hydrogen from the proton exchange membrane hydrogen production module 401 into the solid oxide electrolysis module 402. During startup, the proton exchange membrane hydrogen production module 401 is first turned on to provide hydrogen as a reducing gas to the solid oxide electrolysis module 402 to prevent oxidation of the materials in the solid oxide electrolysis module 402.

[0057] In some embodiments of the off-grid hybrid electrolysis hydrogen production system, as shown in FIG3 , the electrolysis unit 40 further includes an alkaline hydrogen production module 403, the input of which is connected to the output of the power conversion unit 30. This solution enriches the types of hydrogen production modules and improves hydrogen production efficiency.

[0058] In some embodiments, the off-grid hybrid electrolysis hydrogen production system described in FIG4 includes an alkaline hydrogen production module equipped with a gas-liquid separator 404, and a proton exchange membrane hydrogen production module 401 equipped with an oxygen outlet. The oxygen outlet of the proton exchange membrane hydrogen production module 401 is connected to the gas-liquid separator 404. The anode-cathode pressure difference of the alkaline hydrogen production module 403 needs to be strictly controlled in the low-load region. To this end, the oxygen outlet gas of the proton exchange membrane hydrogen production module 401 is introduced into the gas-liquid separator 404 of the alkaline hydrogen production module 403 to assist in regulating the anode-cathode pressure difference of the alkaline hydrogen production module 403.

[0059] Furthermore, as shown in FIG4 , in the off-grid hybrid electrolysis hydrogen production system, the cold air output by the gas-liquid separator 404 is partially output to the cooling gas input port of the power conversion unit 30 to cool the power conversion unit 30. Specifically, the cold air is introduced into the back plate heat exchanger of the heating device of the power conversion unit 30. This solution cools the power conversion unit 30 by recovering the cold energy of the oxygen at the outlet of the gas-liquid separator 404, thereby reducing the load of additional cooling water. In specific implementation, the oxygen flow rate at the outlet of the gas-liquid separator 404 is proportionally matched to the power value of the power conversion unit 30, and thus has automatic negative feedback self-regulation capability.

[0060] Furthermore, as shown in FIG5 , the off-grid hybrid electrolysis hydrogen production system further includes a heat exchange unit, including a thermal coupling module 405 . The thermal coupling module 405 is in contact with the proton exchange membrane hydrogen production module 401 , the solid oxide electrolysis module 402 , and the alkaline hydrogen production module 403 . The thermal coupling module 405 can also be used to convert and store excess electrical energy when the electrical energy provided by the power conversion unit 30 exceeds the electrical energy required for hydrogen production; and to release thermal energy to the proton exchange membrane hydrogen production module 401 and / or the solid oxide electrolysis module 402 and / or the alkaline hydrogen production module 403 when the new energy power generation unit 10 stops providing electrical energy. The thermal coupling module 405 can be made of insulating solid heat storage materials such as graphite, magnesia bricks, concrete, coal-grade materials, etc. By providing the thermal coupling module 405 , cascaded energy utilization can be achieved, allowing heat to be transferred across different times and spaces. In a specific implementation, the thermal coupling connection module 405 can store heat when the electric energy provided by the new energy power generation unit 10 is abundant. When there is no wind or sunlight, and the new energy power generation unit 10 has no electric energy output, the thermal coupling connection module 405 provides heat to the alkaline hydrogen production module 403. Because the cold start time of the alkaline hydrogen production module 403 can be as long as 1-2 hours, the thermal coupling connection module 405 prevents the alkaline hydrogen production module 403 from entering a cold state, thereby improving the life and rapid response capability of the alkaline hydrogen production module 403. Among them, the distance between the solid oxide electrolysis module 402 and the proton exchange membrane hydrogen production module 401 can also be set closer to achieve radiation heat transfer between the two. Because the solid oxide electrolysis module 402 needs to be operated at a temperature of 750°C, it has the function of radiation heat transfer.

[0061] As shown in Figure 6, the heat exchange unit also includes a heat exchange network module 406, which is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module 401 and the refrigeration submodule of the alkaline hydrogen production module 403; the heat exchange network module 406 is connected to the power conversion unit 30, and the heat exchange network module 406 is used to cool the power conversion unit 30. In the present application, the separation unit of the proton exchange membrane hydrogen production module 401 (such as the steam-water separation cooling function module, the circulating water heating function module, and the purification module) and the separation unit of the alkaline hydrogen production module 403 (such as the steam-water separation cooling function module, the alkali liquid circulation heating function module, and the purification function module) are jointly designed as a heat exchange network module 406. The heat exchange network module 406 can be provided with multiple switching valves, and the connection or disconnection of the above-mentioned functional modules can be achieved by switching the valves, thereby improving the operational flexibility of the heat exchange process. The heat exchange network module 406 can be adsorption refrigeration, vapor compression refrigeration, steam absorption refrigeration, steam jet refrigeration, thermoelectric refrigeration, magnetic refrigeration, acoustic refrigeration, etc. The cooling capacity of the heat exchange network module 406 can be used to cool the power conversion unit 30, avoiding the need for additional cooling water. The proton exchange membrane hydrogen production module 401 and the solid oxide electrolysis module are thermally coupled by heat conduction or heat radiation.

[0062] As shown in FIG7 , the off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0063] Water source 50 is used to provide pure water for hydrogen production. Pipeline 501, partially located outside the power conversion unit 30, has its input connected to the water source 50 and its output connected to the water inlet of the electrolysis unit 40. In this solution, room-temperature pure water (no cooling water required) used for electrolytic hydrogen production is first passed through the heat dissipation surface of the power conversion unit 30 to remove heat from the unit and avoid additional cooling water load.

[0064] As shown in FIG8 , the off-grid hybrid electrolysis hydrogen production system described in some solutions further includes:

[0065] The alkali liquid tank 60 is used to provide alkali liquid to the alkaline hydrogen production module 403. A portion of the alkali liquid delivery pipe 601 is located outside the power conversion unit 30, with its input end connected to the alkali liquid tank 60 and its output end connected to the alkali liquid inlet of the alkaline hydrogen production module 403. In this solution, fresh alkali liquid or recycled alkali liquid from the alkali liquid tank 60 is passed through the alkali liquid delivery pipe 601 through the heat dissipation surface of the power conversion unit 30, removing heat from the power conversion unit 30 and avoiding additional cooling water load.

[0066] In the above scheme, as shown in Figure 9, the new energy power generation unit 10 in the off-grid hybrid electrolysis hydrogen production system includes a wind power generation module 101 and a photovoltaic power generation module 102; the controller 100 tracks the output power value of the new energy power generation unit 10 and adjusts the output power value of the energy storage unit 20 according to the tracking result; if the tracking result exceeds the set range, the energy storage unit 20 is controlled to store the excess power; if the tracking result is lower than the set range, the energy storage unit 20 is controlled to output power to supplement the power difference between the tracking result and the set range. Through this scheme, the controller 100 can control the power fluctuations generated by the wind power generation module 101 and the photovoltaic power generation module 102 within a certain range, and can achieve the same stability as the power grid, thereby replacing the power supply function of the power grid. This scheme can operate stably in an off-grid state.

[0067] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of this application.

Claims

1. An off-grid hybrid electrolysis hydrogen production system, characterized in that: include: A new energy power generation unit, comprising at least one power generation module driven by new energy; Energy storage unit, used to store or release electrical energy; A power conversion unit, whose input end is connected to the new energy power generation unit and the energy storage unit, and is used to convert the electric energy output by the new energy power generation unit and the energy storage unit into electric energy suitable for hydrogen production; An electrolysis unit, comprising a proton exchange membrane hydrogen production module and a solid oxide electrolysis module; the input end of the electrolysis unit is connected to the output end of the power conversion unit, and the electrolysis unit generates hydrogen after receiving electric energy; A controller is connected to the new energy power generation unit, the energy storage unit, and the power conversion unit; the controller allocates the electric energy required by the energy storage unit and the hybrid electrolysis hydrogen production system according to the output electric energy value of the new energy power generation unit; the energy storage unit is used to provide a reference voltage and frequency to the hybrid electrolysis hydrogen production system, and translate the fluctuation of the new energy power generation unit so that the total electric energy fluctuation value output by the new energy power generation unit and the energy storage unit is within a set range.

2. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: The solid oxide electrolysis module is provided with a reducing gas inlet; The proton exchange membrane hydrogen production module is equipped with a hydrogen outlet; The hydrogen outlet is sealed and connected to the reducing gas inlet, and part of the hydrogen produced by the proton exchange membrane hydrogen production module is transported to the solid oxide electrolysis module.

3. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: The electrolysis unit also includes: An alkaline hydrogen production module, wherein the input end of the alkaline hydrogen production module is connected to the output end of the power conversion unit.

4. The off-grid hybrid electrolysis hydrogen production system according to claim 3, characterized in that: The alkaline hydrogen production module is equipped with a gas-liquid separator, and the proton exchange membrane hydrogen production module is equipped with an oxygen outlet, and the oxygen outlet of the proton exchange membrane hydrogen production module is connected to the gas-liquid separator.

5. The off-grid hybrid electrolysis hydrogen production system according to claim 4, characterized in that: The cold air output from the gas-liquid separator is partially output to a cooling gas input port of the power conversion unit to cool the power conversion unit.

6. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: A heat exchange unit, comprising a thermal coupling connection module; The thermal coupling connection module has energy interaction with the proton exchange membrane hydrogen production module, the solid oxide electrolysis module and the alkaline hydrogen production module; The thermal coupling connection module includes a heat storage module, and the heat storage module includes one or more of a sensible heat storage submodule, a latent heat storage submodule and a thermochemical heat storage submodule; The heat storage module is used to convert and store excess electrical energy into thermal energy when the electrical energy provided by the power conversion unit is greater than the electrical energy required for hydrogen production; When the new energy power generation unit stops providing electric energy, heat energy is released to the proton exchange membrane hydrogen production module and / or the solid oxide electrolysis module and / or the alkaline hydrogen production module.

7. The off-grid hybrid electrolysis hydrogen production system according to claim 6, characterized in that: The heat exchange unit further comprises: A heat exchange network module is obtained by encapsulating the separation submodule of the proton exchange membrane hydrogen production module and the refrigeration submodule of the alkaline hydrogen production module; The heat exchange network module is connected to the power conversion unit, and the heat exchange network module is used to cool the power conversion unit.

8. The off-grid hybrid electrolysis hydrogen production system according to claim 1, characterized in that: Also includes: Water source, used to provide pure water for hydrogen production; A pipeline, a part of which is arranged outside the power conversion unit, has an input end connected to the water source, and an output end connected to the water inlet end of the electrolysis unit.

9. The off-grid hybrid electrolysis hydrogen production system according to any one of claims 3 to 5, characterized in that: Also includes: An alkaline liquid tank, used for providing alkaline liquid to the alkaline hydrogen production module; A part of the alkali solution delivery pipe is arranged outside the power conversion unit, an input end of which is connected to the alkali solution tank, and an output end of which is connected to an alkali solution inlet end of the alkaline hydrogen production module providing alkali solution.

10. The off-grid hybrid electrolysis hydrogen production system according to any one of claims 1 to 9, characterized in that: The new energy power generation unit includes a wind power generation module and a photovoltaic power generation module; The controller tracks the output electric energy value of the new energy power generation unit to obtain an electric energy prediction value, and adjusts the electric energy required by the hybrid electrolysis hydrogen production system and the energy storage unit according to the electric energy prediction value; If the predicted electric energy value of the new energy power generation unit exceeds the actual output value, the energy storage unit is controlled to store the excess electric energy; if the predicted electric energy value is lower than the actual output value, the energy storage unit is controlled to output electric energy to supplement the required electric energy difference of the hybrid electrolysis hydrogen production system.

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